design, directions, song, guidelines,

1. The architecture, who designed our home died yesterday.
2. We should try to design the interior of your house.
3. He didn't give me correct directions regarding my tax payments.
4. He didn't give me correct directions to go to his house.
5. I was asking for guidelines in order to solve the problem with the tax payments.
6. The word песня refers to both instrumental and vocal pieces in Russia. E.g. I cannot play this piece / song on the piano.

Also a question regarding the correct English strucutre of , and :.
If I want to say:
My question is the following, what kind of tax do you pay ...
My question is the following, according to the Russian law ...

or is it better to use:
My question is the following: what kind of tax do you pay ...
My question is the following: according to the Russian law ...

To answer your question about the English punctuation, it's better to use the colon there. Colons act as a break in the sentence the same commas do, but are used to define new information. For example: <-- (That's an example in itself, haha... okay, but really an example now: )My question: Where were you on the night of the fifth?

A comma is best used to keep the flow of the sentence and to create a pause where needed or to make mention of information that a sentence can be completely understood without. For example:The sun, brightly shinning its blinding light, seemed to engulf the world before me.

As you can see, the information in between the commas can be completely left out and the sentence's meaning would remain unchanged. Commas are also used to list things out, but that's the most obvious use, which I think you know of already. e.g. "Buy eggs, milk, and bacon from the store."

To answer your question about the English punctuation, it's better to use the colon there. Colons act as a break in the sentence the same commas do, but are used to define new information. For example: <-- (That's an example in itself, haha... okay, but really an example now: )My question: Where were you on the night of the fifth?

A comma is best used to keep the flow of the sentence and to create a pause where needed or to make mention of information that a sentence can be completely understood without. For example:The sun, brightly shinning its blinding light, seemed to engulf the world before me.

As you can see, the information in between the commas can be completely left out and the sentence's meaning would remain unchanged. Commas are also used to list things out, but that's the most obvious use, which I think you know of already. e.g. "Buy eggs, milk, and bacon from the store."

So the word for driving directions is указание/инструкция and not направление?

If you talk about "one direction" - it is ok to use it:
"Езжайте в противоположном направлении"
"Направляйтесь прямо по улице" (verb!).
"Я не увидел в каком направлении он уехал".
"В каком направлении находится его дом?" (Possible answer: "К югу отсюда.")
And so on.
But if we talk about instructions how to reach some point with many steps (go forwad, turn left, go along river to the bridge, cross bridge, etc) it becomes complex thing and we cannot say "направления" about it.

If you talk about "one direction" - it is ok to use it:
"Езжайте в противоположном направлении"
"Направляйтесь прямо по улице" (verb!).
"Я не увидел в каком направлении он уехал".
"В каком направлении находится его дом?" (Possible answer: "К югу отсюда.")
And so on.
But if we talk about instructions how to reach some point with many steps (go forwad, turn left, go along river to the bridge, cross bridge, etc) it becomes complex thing and we cannot say "направления" about it.

Believe me I have used erroneously this word so many times with russian friends.
"Конечно я отправлю тебе по мыло направления к моему офису".
This language is killing me. The initial enthusiasm when I started 4 years ago is leaving from my eyes some times.
But then it comes back more aggressive and fierce than never before.

It is simple: in russian word "направление" is "vector in space-time".
In physics there is strong difference between "path" and "distance". The same thing is here.
In fact you can use "направить" as something similar to "command", like "Они направили исследования на изучение черных дыр", but it still about "They move researches along direct line to the black holes".